Make it yourself, then.
There are so many things which would 'deserve' a Stand. Up To... night (although hopefully a less shitty version of the cancer one). Mental illness, child abuse, Alzheimer's, anti semitism, racism, heart disease, obesity, child labour, chronic illness, relative poverty, pollution, strokes, extremism, animal abuse, alcoholism, drug addiction, Islamophobia, forced marriage (well, a form of violence against women), etc. All of them would be worthy of a Stand Up To... thing. And so would Stand Up to Violence Against Women, of course, but it won't happen for certain if no one does something about it.
Cancer is, for many, an 'easier' thing kt raise awareness for/have a night for. People ioin in and don't feel attacked (because, however wrongly, some men will do the NAMALT thing, or similar, and the MRAs would cry misandry, it's all too predictable). It isn't controversial (although it really shouldn't be controversial) and people can watch and join in, and feel good about themselves.